Buffer tank

Buffer tank

  • Is it necessary to have a buffer tank for a wood fired boiler? Open or Close

    According to the Regulation, the buffer tank is only necessary when the boiler does not have the ability to decrease its power at 30% of maximum. Usually this restriction occurs in pyrolytic boilers rather than in simple combustion boilers.

    The container may give an economy of 2% to 20% depending on the fuel and the boiler installation. The cost of a proper, integrated installation with buffer tank ranges between 1.800 and 4.500 euro. It is only a matter of amortization and wood purchase price in order to decide whether it is worth installing the tank or not.

    The buffer tank stores hot water (energy) which will be available when the boiler is not fired up. In this case, close attention must be paid to the size of the container which usually should be greater than one ton.

    The Axinar wood boiler features integrated control for the buffer tank. The control mode is Axinar’s innovation. When the container is cold, the boiler’s water heats the house directly. When the house is warm and during the time when the thermostat has reached the desired temperature, the water in the container is heated. When the container reaches the desired temperature, it enters the rest of the circuit. This connection has all the benefits of a buffer tank and eliminates the container’s drawback from the time of the first startup until the water’s warm up.

  • I needed a boiler of X calories but I put a buffer tank because it makes the boiler produce 2X calories! Open or Close

    Either the restless construction has been discovered, or the container generates calories! Another imaginative idea... This case may be explained either by an example of popularized engineering or by mechanical conditions. We present a physical analogy as simply as possible.

    We assume that the boiler is a faucet dripping a drop of heat every second. In other words, we have a heat drop per second. Underneath we have a glass with a small hole at the bottom, discarding one drop of water every second. Since the pace of adding and discarding is steady, the glass’ heat level does not drop. When we close the tap, the adding stops and the glass is emptied (the glass represents the house and the water level is the home temperature). If you have to wait for the glass to be refilled drop by drop, it will take a very long time.

    If we want to stop filling the glass, instead of closing the tap we put a saucepan that stores the water. When we want to fill the glass, we use the water in the saucepan that has been slowly filled. The pan has been filled drop by drop but it empties all together. The rate that the tap drops the water did not change. What has changed is the management system. Because of the fact that we used the saucepan (buffer tank), it doesn’t mean that the faucet (boiler) produces more drops of heat (calories).

    If we didn’t have the saucepan (buffer tank), we would have to use a much larger faucet (boiler) in order to fill the glass (when totally empty) at a faster rate.

    It’s another thing to manage the heating in different ways and another to modify a boiler of 30 calories and make it to be 60 calories!

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